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| Number | Title | Issue Date |
| 7236860 | Method and system for ensuring that a train does not pass an improperly configured device A train control system includes a positioning system and consults a database to determine when the train is approaching a configurable device such as a switch or grade crossing gate. The system continuously interrogates the device to determine its status as the trai... | 06/26/2007 |
| 7196636 | Railroad crossing warning system A highway/railroad crossing detection and warning system which uses sets of Doppler radar transmitters and receivers to detect the approach of a train coming from either direction toward a highway crossing. The Doppler radar sets are located an extended distance fro... | 03/27/2007 |
| 7075427 | Traffic warning system The present invention is directed to a train detection system for detecting the velocity, presence, and direction of a railroad car which may be utilized in existing railroad crossing installations. The train detection system is suitable for self-testing of its comp... | 07/11/2006 |
| 7037028 | Security barrier A security barrier includes a horizontal composite beam extending across a roadway is mounted between vertical posts at either end of the beam. Hydraulic cylinders fastened at each beam end and to the vertical posts cause the beam to be raised and lowered, as needed... | 05/02/2006 |
| 6996461 | Method and system for ensuring that a train does not pass an improperly configured device A train control system includes a positioning system and consults a database to determine when the train is approaching a configurable device such as a switch or grade crossing gate. The system continuously interrogates the device to determine its status as the trai... | 02/07/2006 |
| 6218961 | Method and system for proximity detection and location determination A system and method for preventing collisions between vehicles, such as railway vehicles, by exchanging data regarding track position of the vehicles. By use of an on-board track database, the system provides an indication of the distance between vehicles... | 04/17/2001 |
| 6195020 | Vehicle presence detection system A system and method which can detect the presence of a vehicle within the protected area of a four gate railroad crossing, determine its location and direction it is moving in, and open an appropriate exit gate to allow the vehicle to escape prior to the ... | 02/27/2001 |
| 5924652 | Island presence detected A reliable and consistent electrical contact path between the rails of a section of railroad track established by the shunting effect of the wheels and axles of a train is ensured by applying time-spaced, short duration electrical pulses to the rails at a... | 07/20/1999 |
| 5890682 | Railway crossing collision avoidance system With the vehicle anti-collision system of the present invention, road vehicles in the vicinity of a railway crossing are alerted as a train approaches the crossing. A signalling device operating in conjunction with a GPS receiver located in the train emit... | 04/06/1999 |
| 5864304 | Wireless railroad grade crossing warning system A railroad-crossing warning system for protecting pedestrians and motorists from an oncoming train. The warning system has a vehicle detector system for determining whether a vehicle is stuck in an area of the railroad crossing, a train detector system fo... | 01/26/1999 |
| 5699986 | Railway crossing collision avoidance system With the vehicle anti-collision system of the present invention, road vehicles in the vicinity of a railway crossing are alerted as a train approaches the crossing. A signalling device operating in conjunction with a GPS receiver located in the train emit... | 12/23/1997 |
| 5464176 | Shunting device A shunting device used on railroad maintenance vehicles, such as pickup trucks and other maintenance vehicles, for transmitting electrical signal through railroad tracks for operating signalling devices and notification to the dispatcher. The shunting dev... | 11/07/1995 |
| 5429329 | Robotic railroad accident prevention vehicle and associated system elements A robotic vehicle (10) is shown with conventional train flanged wheels (11) riding upon common railroad tracks (12). The body (13) of the vehicle encloses a conventional diesel electric power unit (14) with speed characteristics comparable to the train it... | 07/04/1995 |
| 5178349 | Railroad signal system An improved railroad signal system is described in which a train is allowed to approach a block even if a red light is activated for the block. A white numbered light is activated indicating the maximum permissible speed of the train. The system includes ... | 01/12/1993 |
| 5170970 | Method and apparatus for improving rail shunts A reliable and consistent electrical contact path between the rails of a railroad track established by the shunting effect of the wheels and axles of a train is ensured by applying an alternating current signal to the rails at a voltage level sufficient t... | 12/15/1992 |
| 5098044 | Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment Highway crossing protection equipment which operates warning lights or crossing gates is controlled from the train locomotive which enters into an interchange of messages via a radio link with the controller at the crossing. If communication is not establ... | 03/24/1992 |
| 5092544 | Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment Highwasy crossing protection equipment which operates warning lights or crossing gates is controlled from the train locomotive which enters into an interchange of messages via a radio link with the controller at the crossing. Communications between the tr... | 03/03/1992 |
| 5054722 | Road-rail shunt A device that attaches to a pneumatic tired convertible rail highway vehicle for the purpose of shunting electrical current of railroad tracks so that the current will actuate signaling devices. The shunt mechanism is actuated by raising and lowering the ... | 10/08/1991 |
| 4942395 | Railroad grade crossing motorist warning system A three-piece, compact wireless railroad grade crossing motorist warning device comprising: a locomotive mounted transceiver which simultaneously communicates (upon close proximity) with a similar transceiver mounted at railroad grade crossing, and motor ... | 07/17/1990 |
| 4613103 | Crossing bell and flasher A model railroad crossing bell and flasher employs spaced photocell detectors along the model railroad track. A comparator receives the photocell detector output signals and upon detecting a train shadow provides power to a first oscillator which actuates... | 09/23/1986 |
